Flexible Cu₂ZnSn(S,Se)₄ solar cells with over 10% efficiency and methods of enlarging the cell area.

ABSTRACT: For kesterite copper zinc tin sulfide/selenide (CZTSSe) solar cells to enter the market, in addition to efficiency improvements, the technological capability to produce flexible and large-area modules with homogeneous properties is necessary. Here, we report a greater than 10% efficiency for a cell area of approximately 0.5 cm² and a greater than 8% efficiency for a cell area larger than 2 cm² of certified flexible CZTSSe solar cells. By designing a thin and multi-layered precursor structure, the formation of defects and defect clusters, particularly tin-related donor defects, is controlled, and the open circuit voltage value is enhanced. Using statistical analysis, we verify that the cell-to-cell and within-cell uniformity characteristics are improved. This study rep

SUBMITTER: Yang KJ 

PROVIDER: S-EPMC6609618 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature